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为达到光盘容量的最大化,基于多层光盘,对现有的调制码进行了优化,并对优化后可能出现的超出jitter允差问题和锁相环(PLL)时钟同步问题进行了分析并给予解决。提出了一种有别于传统的多层混合时钟同步信号获取方法,用以满足PLL稳定工作的要求,并用数理方法验证了这种方法的有效性。最后选用d=4和k=10～15作为多层并行读写光盘调制码的参数,最大码率时可提高光盘的线密度15%～23%。
In order to maximize the capacity of the optical disc, existing modulation codes are optimized based on the multi-layer optical disc, and the problems of jitter tolerance and phase-locked loop (PLL) clock synchronization which may appear after optimization are analyzed and given solve. This paper presents a different from the traditional multi-layer hybrid clock synchronization signal acquisition method to meet the stability requirements of the PLL, and the use of mathematical methods to verify the effectiveness of this method. Finally, d = 4 and k = 10-15 are selected as the parameters for parallel read / write optical disc modulation codes. The maximum code rate can increase the linear density of the optical disc by 15% -23%.